I’m re-reading the Heinlein Juveniles, and it’s very interesting which bits make me splutter at the implausibility and which just make me go “ah, old SF...".
Going to the Moon in a home-welded ship and meeting Nazis there? Human-safe atmosphere on Venus? Canals and Martians on Mars? Making enough oxygen for three or four people with a couple of dozen rhubarb plants? Sure!
But ruins of cities on the moon? The asteroid belt being the remains of a destroys planet? Ludicrously short radiation-decay-to-safe times? Oh, come on!
(I do wonder why rhubarb, though.)
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